212 PROCEEDINGS OF SOCIETIES, 



section. Below the ganoine the interval between the short vertical 

 canals, more or less cup-shaped in the section, were seen to be, for 

 the most part, traversed each by a short vertical tube coming up 

 from tlie Haversian network below, and dividing in an arborescent 

 manner into a multitude of minute ramifying tubules, passing 

 towards, but not into, the ganoine above. The branches of adjacent 

 trees of this kind also freely communicated with each other around 

 and between the short vertical canals, between which their stems 

 were situated. It must be noted, however, that osseous lacunae 

 were occasionally seen among its minute tubules. Lacunae of the 

 normal type abounded in the substance of the bone below. 



" Winter Egg" of Notommata. — Mr. Crowe showed the "winter 

 egg " of a Notommata-species, much resembling in external figure the 

 zygospore of certain Desmids, its long spines dilated below, covering 

 the surface and extending radially in all directions, the apices some- 

 what curved. 



Irish, Thysanura. — Dr. E. Perceval Wright exhibited a small col- 

 lection of Thysanura made within the compass of a two-acre field at 

 Howth, consisting of Orchesella cincta, Tomoceros longicornis, 

 T.plumhea, Lepidocyrtus curcicollis, L.purpureus, Degeeria nivalis, 

 Isoloma anglicana, Lipura inaritima, and MacJiilis maritimus. 

 Several of these had not previousl}^ been recorded as Irish. No 

 group of Arthropods needed investigation more than this, and none 

 required a more patient microscopical investigation to determine 

 not only the limits of the species, but also of the genera. 



In noticing the recent ' Monograph on the Collembola and Thy- 

 sanura ' by Sir John Lubbock, Dr. Wright pointed out a few errors, 

 both of commission and of omission, tliat had struck him on a hasty 

 glance over the volume ; the typographical errors were not only 

 very numerous, but in some places extremely puzzling. 



Amoeba toith r£markable posterior linear processes. — Mr. Archer 

 drew attention of the meeting to a remarkable and weil-pronounced 

 examj)le of the same condition in Amoeba once before shown to the 

 Club (see Minutes of the Club, February, 1S66), consisting in the 

 projection from iXxe posterior eY\(S. of a number of linear prolongations 

 of the body substance (like a bundle of dip-candles, if the candles 

 were of varying lengths!). These prolongations or processes 

 possessed a certain amount of temporary rigidity, and gave a very 

 odd-looking appearance to the specimen ; it was in active progression, 

 and the behaviour (as regards flow of contents, locomotion, &c.) 

 was quite that of an A. villosa. 



Cosmocladium Saxonicum, de Bary , exhibited. — Mr. Archer showed 

 examples from Counemara of the seemingly widely distributed, but 

 alwa3s extremely scanty, alga, Cosmocladium Saxonicum, de Bary, 

 drawing attention to the points dwelt upon by de Bary as dis- 

 tinguishing this form from O. pulchelluin, Breb., which latter had 

 not appeared in this country. The supposition is, however, open 

 that these may be one and the same tbijig, and the confusion (if 

 any) due to a certain want of definiteness as regards de Brebisson's 

 description and figure. 



